Particulates Effect on Rainfall

  • Released Tuesday, December 9, 2003
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Normal rainfall droplet creation involves water vapor condensing on particles in clouds. The droplets eventually coalesce together to form drops large enough to fall to Earth. However, as more and more pollution particles (aerosols) enter a rain cloud, the same amount of water becomes spread out. These smaller water droplets float with the air and are prevented from coalescing and growing large enough for a raindrop. Thus, the cloud yields less rainfall over the course of its liftime compared to a clean (non-polluted) cloud of the same size. The split screen compares a normal rain producing cloud (left) with the lack of rain produced from a cloud full of aerosols from pollution.


Please give credit for this item to:
NASA/Goddard Space Flight Center Conceptual Image Lab

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This page was originally published on Tuesday, December 9, 2003.
This page was last updated on Wednesday, May 3, 2023 at 1:56 PM EDT.